SOLUTION: X and Y can assemble machine parts together in 30 days. They started work and Y left work after 20 days. X assemnled the remaining machine parts in 20 days. In how many days X can

Question 1184804: X and Y can assemble machine parts together in 30 days. They started work and Y left work after 20 days. X assemnled the remaining machine parts in 20 days. In how many days X can assemble machine parts by himself?
Answer by josgarithmetic(39627) (Show Source): You can put this solution on YOUR website!

Equations might be easier to handle if a substitution is made:
and

Elimination Method should be easier this way.
-
E2-E1:

Back-substituting, ------------
and you can solve for y whatever way you want.
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